Electrode for open arc lamps



Jan. 18, 1938. 1. SILBERSTEIN 2,106,126 I ELECTRODE FOR OPEN ARCiLAMPS Filed April 6, 1936 .772 0872 for flawj/gaarum Patented Jan. 18, 1938 UNITED STATES PATENT OFFICE -Isidor Silberstein, Paris, France, assignor to Prof. Dr. Max Volmer, Neubabelsberg-Steinstucken, Germany Application April 6, 1936, Serial No. 73,047 In Germany February 2, 1935 4 Claims.

The invention relates to electrodes for open arc-lamps, such as used for irradiating purposes in therapeutics. Such electrodes consist of nonoxidizable substances and are generally small in size which entails the drawback that it is difficult to attach them to the respective electrode holders of the lamp, the main disadvantage being the proximity of the arc. It is not possible to secure the electrodes reliably to the holders in the usual manner, as for instance by means of screws or elastic clamps of conventional design, due to the fact that the screw threads and the springs become soon useless under the circumstances stated.

It is an object of the invention to overcome the above named disadvantages by employing electrodes of novel and very simple but nevertheless practical construction. According to the present invention the electrodes are provided at their rear end with a resilient metallic member which in turn is employed for securing the electrode to the electrode holder. The electrode holder may consist, depending upon the construction of the resilient member, of a simple tube or a mandrel, which holder may be easily constructed to be able to permanently withstand the high temperatures. The resilient metallic member, which forms a part of the electrode, however, need only retain its resiliency as long as the consumable body of the electrode exists. After the electrode is burned down and has to be replaced, the resilient member thrown away together with the rest of the electrode, and a new electrode having a resilient connecting member already attached thereto, is connected with the holder.

The invention is illustrated diagrammatically and by way of example in the accompanying drawing in which Figure 1 is a side-view of the electrode, and Figure 2 a rear-view of the same. Figure 3 shows a modification in a view similar to Fig. 1, while Figure 4 is a plan view of this modification.

Referring to Figs. 1 and 2, a denotes the body of the electrode which consists of a non-oxidizable substance or of a composition of such substances, and b is a pivot-like holder Which is attached at one end of the electrode body aand is arranged in axial alinement therewith, e denotes the fastening member which is formed in this example of a U-shaped leaf-spring, the resilient legs of which are so curved that the whole member a resembles to a certain degree a connecting plug as used in combination with electric sockets. In the modification illustrated in the Figs. 3 and 4, the resilient fastening member is formed by a longitudinally slotted piece of tube at which has two oppositely located bores for the passage and attachment of the pin 12. The electrode-holder proper (not shown) is, of course, so designed that it is adapted to receive the respective fastening member used, either 0 or d. For the first embodiment, the electrode holder constitutes a sort of socket, while for the other embodiment, the electrode holder is formed by a sort of mandrel. It is not suitable for the purpose in view to connect the resilient member directly with the body of the electrode, but to efiect the connection by the intermediary of a pin b, consisting preferably of chromo-nickel or an equivalent refractory alloy.

This pin b may be connected with and attached to the fastening member 0 or d in any desired manner. If desired the elasticity of the fastening member may be used for this purpose.

I claim:

l. The combination with an electrode for open arc-lamps, of a conductor pin attached at one end of the body of the electrode and in axial alinement with the same, and a resilient member provided with two substantially parallel legs connected with each other at one end, said resilient member being attached transversely to said pin and being provided to be connected with an electrode holder.

2. The combination with an electrode for open arc-lamps, of a conductor pin attached at one end of the body of the electrode and in axial alinement with the same, and a resilient member consisting of a metallic tube slotted from end to end, said conductor pin being rigidly attached transversely to said slotted tube which is provided to be connected with an electrode holder.

3. The combination with an electrode for open arc-lamps, of a conductor pin attached at one end of the body of the electrode and in axial alinement with the same, and a resilient member consisting of a metallic tube slotted from end to end to render the same resilient, said conductor pin extending transversely through said tube and being rigidly connected thereto, said tube being provided to be connected with an electrode holder.

4. In combination with an electrode for open arc-lamps, a pin fixedly attached to one end of the body of the electrode and in axial alignment with the same, and a longitudinal member of resilient material in the form of a loop and split to render the member as such resilient, said member being attached transversely to said pin and together with the pin constituting a unit for connection as such with an electrode holder.

ISIDOR SILBERSTEIN. 

